Accessory dwelling unit builders — Cambridge, MA
Last updated: September 24, 2026
What affects the price
Building an ADU is a custom project, so costs vary based on your specific choices. Site conditions are the biggest factor; if your land requires significant grading, utility extensions, or foundation work, those expenses add up quickly. Choosing high-end finishes, custom cabinetry, or complex roof lines will also push the budget higher compared to a standard design. Prefabricated units often offer predictable costs, while custom site-built structures allow for more flexibility but can be harder to estimate upfront. Exact pricing confirmed free on the call.
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Frequently asked in Cambridge
What is the cost of an ADU in Cambridge, Massachusetts?
Where can I find an accessory dwelling unit near me in Cambridge?
What does accessory dwelling unit rental mean in Cambridge?
What are the requirements for an accessory dwelling unit permit in Cambridge?
What is the timeline for a 24-hour ADU project in Cambridge?
Can I get an accessory dwelling unit in New Hampshire if I live in Cambridge?
No, if you are in Cambridge, you need an accessory dwelling unit contractor licensed and knowledgeable about Massachusetts regulations, not New Hampshire. Local professionals understand the specific building codes, zoning laws, and permitting processes unique to Cambridge and the surrounding Boston metropolitan area. This local expertise is crucial for ensuring your ADU is compliant and built to withstand regional conditions. Their guidance is essential.
What does accessory dwelling unit mean regarding its purpose and design in Cambridge?
Also serving nearby: Newton · Boston · Quincy · Lynn · Brockton
More on this: HUD ADU resources — ADU policy and financing research.
Service area details
Serving all of Cambridge — population 118,214; about 18,479 residents per square mile across 6.4 sq mi. ZIP codes covered include 02138, 02139, 02140, 02141, 02142, 02238.
Neighborhoods served in Cambridge: Harvard Square, Central Square, Kendall Square, Inman Square, Porter Square — and every surrounding area.
Areas we serve
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California (4)
All of California · Fairfield · Murrieta · Richmond · Vallejo